BPSK31 is a good mode for low power, but it falls apart on decoding with moderate to severe multipathing moments, If you have stable conditions say going over the poles on DX it requires little power. With Polar flutter and multipath moments can create many errors in this mode with no FEC built into mode, but great Signal noise ratio attributes which is much greater than SSB or some other wider modes.

BPSK31 is one of the more popular data modes.

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